# Engine & Aftertreatment — mobile service in Atlanta / Metro ATL

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Aftertreatment problems are usually engine problems wearing a disguise. We diagnose the fuel, air and cooling side properly before touching the emissions hardware, which is what keeps the repair from coming back three weeks later.

## Engine repair

In-frame and component-level diesel repair

Cylinder head work, valve adjustment, gaskets and seals, oil leaks, low power and excessive blow-by. We scope the job against the duty cycle and the remaining life of the unit before recommending it.

## DPF and emissions systems

Regen faults, sensors, DEF and derate diagnosis

Incomplete regen, repeat derates, DEF quality and dosing faults, differential pressure and NOx sensor problems, and cleaning or replacement of restricted filters. All work restores the emissions system to its required operating condition.

## Fuel systems and injection

Injectors, pumps, rails and return testing

Injector testing and replacement, high-pressure pump diagnosis, rail pressure faults, return-flow testing and contaminated fuel cleanup. Hard starting, rough running and low power usually resolve here.

## Cooling system repair and diesel flush

Overheat diagnosis, radiators, flush service

Overheating diagnosis, radiator and charge air cooler service, water pump and thermostat replacement, fan clutch faults, and full diesel coolant flush with the correct specification coolant.

## Glow plug service

Cold-start circuits, controllers and plugs

Glow plug, relay and controller testing and replacement, plus intake heater diagnosis. Addresses hard cold starting, rough warm-up and white smoke on start.

## Hard start and no start

Systematic fuel, air, compression and electrical

A structured no-start diagnosis covering electrical supply, fuel delivery and pressure, air intake and compression, rather than replacing parts in sequence until it fires.

## Air system repair

Compressors, dryers, valves and leak isolation

Air compressor and dryer service, governor and valve faults, air leak isolation, and low-pressure or slow-build complaints affecting brakes and suspension.

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